\ProvidesFileRCS $Header: /cvsroot/pgf/pgf/generic/pgf/systemlayer/pgfsys-common-svg.def,v 1.13 2005/11/15 17:46:37 tantau Exp $

% Copyright 2005 by Till Tantau <tantau@cs.tu-berlin.de>.
%
% This program can be redistributed and/or modified under the terms
% of the GNU Public License, version 2.




% Driver commands for svg


% Helping functions:
\let\pgf@sys@svgpath=\@empty
\def\pgf@sys@svgnum#1{%
  {%
    \pgf@x=#1\relax%
    \edef\temp{\expandafter\Pgf@geT\the\pgf@x\space}%
    \toks@\expandafter\expandafter\expandafter{\expandafter\pgf@sys@svgpath\temp}%
    \xdef\pgf@sys@svgpath{\the\toks@}%
  }%
}
\def\pgf@sys@addtosvgpath#1{\g@addto@macro\pgf@sys@svgpath{#1\space}}
\def\pgf@sys@flushsvgpath{\pgfsysprotocol@literal{\pgf@sys@svgpath}\global\let\pgf@sys@svgpath=\@empty}
\def\pgf@sys@svg@gs#1{%
  {\pgfsysprotocol@literal{<g #1>\Hnewline }}\global\advance\pgf@sys@svg@scopecount by1\relax%
}
\newcount\pgf@sys@svg@objectcount
\let\Hnewline=\@empty

% Path construction:
\def\pgfsys@lineto#1#2{\pgf@sys@addtosvgpath{L }\pgf@sys@svgnum{#1}\pgf@sys@svgnum{#2}}
\def\pgfsys@moveto#1#2{\pgf@sys@addtosvgpath{M }\pgf@sys@svgnum{#1}\pgf@sys@svgnum{#2}}
\def\pgfsys@curveto#1#2#3#4#5#6{%
  \pgf@sys@addtosvgpath{C }%
  \pgf@sys@svgnum{#1}\pgf@sys@svgnum{#2}%
  \pgf@sys@svgnum{#3}\pgf@sys@svgnum{#4}%
  \pgf@sys@svgnum{#5}\pgf@sys@svgnum{#6}}
\def\pgfsys@rect#1#2#3#4{%
  \pgfsys@moveto{#1}{#2}%
  \pgf@sys@addtosvgpath{h }\pgf@sys@svgnum{#3}%
  \pgf@sys@addtosvgpath{v }\pgf@sys@svgnum{#4}%
  \pgf@sys@addtosvgpath{h }{\pgf@x=#3\pgf@x=-\pgf@x\pgf@sys@svgnum{\pgf@x}}%
  \pgfsys@closepath}
\def\pgfsys@closepath{\pgf@sys@addtosvgpath{Z}}

% Path usage:
\newif\ifpgf@sys@svg@clipnext
\def\pgf@sys@svg@possiblyclippedpath#1{%
  \ifpgf@sys@svg@clipnext%
    \global\advance\pgf@sys@svg@objectcount by1\relax%
    \pgfsysprotocol@literal{<clipPath id="pgfcp\the\pgf@sys@svg@objectcount">
      <path id="pgfpath\the\pgf@sys@svg@objectcount" d="}%
    \pgf@sys@flushsvgpath%
    \pgfsysprotocol@literal{"/>\Hnewline  </clipPath>\Hnewline }
    \pgfsysprotocol@literal{<use xlink:href="\#pgfpath\the\pgf@sys@svg@objectcount" #1/>\Hnewline }%
    \pgf@sys@svg@gs{clip-path="url(\#pgfcp\the\pgf@sys@svg@objectcount)"}
    \pgf@sys@svg@clipnextfalse%
  \else%
    \pgfsysprotocol@literal{<path d="}%
    \pgf@sys@flushsvgpath%
    \pgfsysprotocol@literal{" #1/>\Hnewline }
  \fi%
}
\def\pgfsys@stroke{\pgf@sys@svg@possiblyclippedpath{style="fill:none"}}
\def\pgfsys@fill{\pgf@sys@svg@possiblyclippedpath{style="stroke:none"}}
\def\pgfsys@fillstroke{\pgf@sys@svg@possiblyclippedpath{}}
\def\pgfsys@clipnext{\pgf@sys@svg@clipnexttrue}
\def\pgfsys@discardpath{%
  \ifpgf@sys@svg@clipnext%
    \global\advance\pgf@sys@svg@objectcount by1\relax%
    \pgfsysprotocol@literal{<clipPath id="pgfcp\the\pgf@sys@svg@objectcount">
      <path d="}%
    \pgf@sys@flushsvgpath%
    \pgfsysprotocol@literal{"/>\Hnewline </clipPath>\Hnewline }
    \pgf@sys@svg@gs{clip-path="url(\#pgfcp\the\pgf@sys@svg@objectcount)"}
    \pgf@sys@svg@clipnextfalse%
  \else%
    \global\let\pgf@sys@svgpath=\@empty
  \fi}

% Fill rules:
\def\pgfsys@eoruletrue{\pgf@sys@svg@gs{fill-rule="evenodd"}}
\def\pgfsys@eorulefalse{\pgf@sys@svg@gs{fill-rule="nonzero"}}

% Transparency:
\def\pgfsys@stroke@opacity#1{\pgf@sys@svg@gs{stroke-opacity="#1"}}
\def\pgfsys@fill@opacity#1{\pgf@sys@svg@gs{fill-opacity="#1"}}

% Transformation:
\def\pgfsys@transformcm#1#2#3#4#5#6{%
  {\pgf@x=#5\pgf@y=#6%
  \pgf@sys@svg@gs{transform="matrix(#1,#2,#3,#4,\pgf@sys@tonumber{\pgf@x},\pgf@sys@tonumber{\pgf@y})"}}}

% Scopes
\newcount\pgf@sys@svg@scopecount
\def\pgfsys@beginscope{%
  \edef\pgf@sys@svg@thescopecount{\the\pgf@sys@svg@scopecount}%
  \begingroup%
    \pgf@sys@svg@scopecount=1\relax%
    \pgfsysprotocol@literal{<g>\Hnewline }%
  }
\def\pgfsys@endscope{%
    \loop%
      \pgfsysprotocol@literal{</g>\Hnewline }%
      \advance\pgf@sys@svg@scopecount by-1\relax%
    \ifnum\pgf@sys@svg@scopecount>0\relax%
    \repeat%
  \endgroup%
  \global\pgf@sys@svg@scopecount=\pgf@sys@svg@thescopecount\relax%  
}

% Graphics state
\def\pgfsys@setdash#1#2{%
  \edef\pgf@test@dashpattern{#1}%
  \ifx\pgf@test@dashpattern\@empty%
    \pgf@sys@svg@gs{stroke-dasharray="none" stroke-dashoffset="#2"}%
  \else%
    \pgf@sys@svg@gs{stroke-dasharray="#1" stroke-dashoffset="#2"}%
  \fi}
\def\pgfsys@setlinewidth#1{\pgf@sys@svg@gs{stroke-width="#1"}}
\def\pgfsys@setmiterlimit#1{\pgf@sys@svg@gs{stroke-miterlimit="#1"}}
\def\pgfsys@buttcap{\pgf@sys@svg@gs{stroke-linecap="butt"}}
\def\pgfsys@roundcap{\pgf@sys@svg@gs{stroke-linecap="round"}}
\def\pgfsys@rectcap{\pgf@sys@svg@gs{stroke-linecap="square"}}
\def\pgfsys@miterjoin{\pgf@sys@svg@gs{stroke-linejoin="miter"}}
\def\pgfsys@roundjoin{\pgf@sys@svg@gs{stroke-linejoin="round"}}
\def\pgfsys@beveljoin{\pgf@sys@svg@gs{stroke-linejoin="bevel"}}


%
% Color management
% 

\def\XC@mcolor{\ifpgfpicture\pgfsetcolor{.}\fi}

\def\pgf@sys@svg@color@rgb#1,#2,#3\relax{%
 {%
    \pgf@xa=#1pt%
    \pgf@xa=100\pgf@xa%
    \pgf@xb=#2pt%
    \pgf@xb=100\pgf@xb%
    \pgf@xc=#3pt%
    \pgf@xc=100\pgf@xc%
    \xdef\pgf@sys@svg@prepared{rgb(\pgf@sys@tonumber\pgf@xa\%,\pgf@sys@tonumber\pgf@xb\%,\pgf@sys@tonumber\pgf@xc\%)}%
  }%
}
\def\pgf@sys@svg@color@cmy#1,#2,#3\relax{%
  {%
    \pgf@xa=1pt%
    \advance\pgf@xa by-#1pt%
    \pgf@xa=100\pgf@xa%
    \pgf@xb=1pt%
    \advance\pgf@xb by-#2pt%
    \pgf@xb=100\pgf@xb%
    \pgf@xc=1pt%
    \advance\pgf@xc by-#3pt%
    \pgf@xc=100\pgf@xc%
    \xdef\pgf@sys@svg@prepared{rgb(\pgf@sys@tonumber\pgf@xa\%,\pgf@sys@tonumber\pgf@xb\%,\pgf@sys@tonumber\pgf@xc\%)}%
  }%
}
\def\pgf@sys@svg@color@cmyk#1,#2,#3,#4\relax{%
  {%
    \pgf@xa=1pt%
    \advance\pgf@xa by-#4pt%
    \pgf@xa=#1\pgf@xa%
    \advance\pgf@xa by#4pt%
    \advance\pgf@xa by-1pt%
    \pgf@xa=-100\pgf@xa%
    \pgf@xb=1pt%
    \advance\pgf@xb by-#4pt%
    \pgf@xb=#2\pgf@xb%
    \advance\pgf@xb by#4pt%
    \advance\pgf@xb by-1pt%
    \pgf@xb=-100\pgf@xb%
    \pgf@xc=1pt%
    \advance\pgf@xc by-#4pt%
    \pgf@xc=#3\pgf@xc%
    \advance\pgf@xc by#4pt%
    \advance\pgf@xc by-1pt%
    \pgf@xc=-100\pgf@xc%
    \xdef\pgf@sys@svg@prepared{rgb(\pgf@sys@tonumber\pgf@xa\%,\pgf@sys@tonumber\pgf@xb\%,\pgf@sys@tonumber\pgf@xc\%)}%
  }%
}
\def\pgf@sys@svg@color@gray#1\relax{%
 {%
    \pgf@xa=#1pt%
    \pgf@xa=100\pgf@xa%
    \xdef\pgf@sys@svg@prepared{rgb(\pgf@sys@tonumber\pgf@xa\%,\pgf@sys@tonumber\pgf@xa\%,\pgf@sys@tonumber\pgf@xa\%)}%
  }%
}

\def\pgfsys@color@rgb@stroke#1#2#3{%
  \pgf@sys@svg@color@rgb#1,#2,#3\relax%
  \pgf@sys@svg@gs{stroke="\pgf@sys@svg@prepared"}}
\def\pgfsys@color@rgb@fill#1#2#3{%
  \pgf@sys@svg@color@rgb#1,#2,#3\relax%
  \pgf@sys@svg@gs{fill="\pgf@sys@svg@prepared"}}
\def\pgfsys@color@cmyk@stroke#1#2#3#4{%
  \pgf@sys@svg@color@cmyk#1,#2,#3,#4\relax%
  \pgf@sys@svg@gs{stroke="\pgf@sys@svg@prepared"}}
\def\pgfsys@color@cmyk@fill#1#2#3#4{%
  \pgf@sys@svg@color@cmyk#1,#2,#3,#4\relax%
  \pgf@sys@svg@gs{fill="\pgf@sys@svg@prepared"}}
\def\pgfsys@color@cmy@stroke#1#2#3{%
  \pgf@sys@svg@color@cmy#1,#2,#3\relax%
  \pgf@sys@svg@gs{stroke="\pgf@sys@svg@prepared"}}
\def\pgfsys@color@cmy@fill#1#2#3{%
  \pgf@sys@svg@color@cmy#1,#2,#3\relax%
  \pgf@sys@svg@gs{fill="\pgf@sys@svg@prepared"}}
\def\pgfsys@color@gray@stroke#1{%
  \pgf@sys@svg@color@gray#1\relax%
  \pgf@sys@svg@gs{stroke="\pgf@sys@svg@prepared"}}
\def\pgfsys@color@gray@fill#1{%
  \pgf@sys@svg@color@gray#1\relax%
  \pgf@sys@svg@gs{fill="\pgf@sys@svg@prepared"}}


% Shadings:
\def\pgf@sys@svg@shading@stops{%
  % Step 1: Compute 1/\pgf@sys@shading@end@pos
  \pgf@x=\pgf@sys@shading@end@pos\relax%
  \c@pgf@counta=\pgf@x\relax%
  \divide\c@pgf@counta by4096\relax%
  % Step 2: Insert stops.
  \expandafter\pgf@sys@svg@shading@dostops\pgf@sys@shading@ranges%
    % dummy for end:
    {{\pgf@sys@shading@end@pos}{\pgf@sys@shading@end@pos}{\pgf@sys@shading@end@rgb}{\pgf@sys@shading@end@rgb}}%
    {}% end
}
\def\pgf@sys@svg@shading@dostops#1{%
  \edef\pgf@test{#1}%
  \ifx\pgf@test\@empty%
  \else%
    \expandafter\pgf@sys@svg@shading@dostop\pgf@test%
    \expandafter\pgf@sys@svg@shading@dostops%
  \fi%
}
\def\pgf@sys@svg@shading@dostop#1#2#3#4{%
  % #1 start pos
  % #2 end pos
  % #3 start rgb
  % #4 end rgb
  \pgf@sys@svg@addtostops{<stop offset="}%
  \pgf@x=#1%
  \pgf@x=16\pgf@x%
  \divide\pgf@x by \c@pgf@counta\relax%
  \pgf@sys@svg@addtostops{\pgf@sys@tonumber\pgf@x" stop-color="}%
  \pgf@sys@svg@shading@dorgb#3%
  \pgf@sys@svg@addtostops{"/>\noexpand\Hnewline}%
}
\def\pgf@sys@svg@shading@dorgb#1#2#3{%
  \pgf@sys@svg@color@rgb#1,#2,#3\relax%
  \pgf@sys@svg@addtostops{\pgf@sys@svg@prepared}%
}

\let\pgf@sys@svg@thestops=\@empty
\def\pgf@sys@svg@addtostops#1{%
  \edef\pgf@temp{#1}%
  \expandafter\expandafter\expandafter\def
  \expandafter\expandafter\expandafter\pgf@sys@svg@thestops
  \expandafter\expandafter\expandafter{\expandafter\pgf@sys@svg@thestops\expandafter\space\pgf@temp}%
}


\def\pgfsys@horishading#1#2#3{%
  {%
    \pgf@parsefunc{#3}%
    \global\advance\pgf@sys@svg@objectcount by1\relax%
    \pgf@sys@svg@addtostops{<linearGradient id="pgfsh\the\pgf@sys@svg@objectcount">\noexpand\Hnewline}
    \pgf@sys@svg@shading@stops%
    \pgf@sys@svg@addtostops{</linearGradient>\noexpand\Hnewline}%
    \pgf@process{\pgfpoint{\pgf@sys@shading@end@pos}{#2}}%
    \expandafter\xdef\csname @pgfshading#1!\endcsname{%
      \def\noexpand\pgf@sys@svg@sh@defs{\noexpand\pgfsysprotocol@literal{\pgf@sys@svg@thestops}}%
      \def\noexpand\pgf@sys@svg@sh{\noexpand\pgfsysprotocol@literal{<rect
        width="\the\pgf@x"
        height="\the\pgf@y"
        style="fill:url(\noexpand\#pgfsh\the\pgf@sys@svg@objectcount);
          stroke:none"/>\noexpand\Hnewline}}%
      \def\noexpand\pgf@sys@svg@pos{\noexpand\pgfpoint{\the\pgf@x}{\the\pgf@y}}%
    }%
  }%
}


\def\pgfsys@vertshading#1#2#3{%
  {%
    \pgf@parsefunc{#3}%
    \global\advance\pgf@sys@svg@objectcount by1\relax%
    \pgf@sys@svg@addtostops{<linearGradient
      id="pgfsh\the\pgf@sys@svg@objectcount"
      gradientTransform="rotate(90)">\noexpand\Hnewline}
    \pgf@sys@svg@shading@stops%
    \pgf@sys@svg@addtostops{</linearGradient>\noexpand\Hnewline}%
    \pgf@process{\pgfpoint{\pgf@sys@shading@end@pos}{#2}}%
    \expandafter\xdef\csname @pgfshading#1!\endcsname{%
      \def\noexpand\pgf@sys@svg@sh@defs{\noexpand\pgfsysprotocol@literal{\pgf@sys@svg@thestops}}%
      \def\noexpand\pgf@sys@svg@sh{\noexpand\pgfsysprotocol@literal{<rect
        width="\the\pgf@y"
        height="\the\pgf@x"
        style="fill:url(\noexpand\#pgfsh\the\pgf@sys@svg@objectcount);
          stroke:none"/>\noexpand\Hnewline}}%
      \def\noexpand\pgf@sys@svg@pos{\noexpand\pgfpoint{\the\pgf@y}{\the\pgf@x}}%
    }%
  }%
}

\def\pgfsys@radialshading#1#2#3{%
  {%
    \pgf@parsefunc{#3}%
    \pgf@x=\pgf@sys@shading@end@pos\relax%
    \c@pgf@counta=\pgf@x\relax%
    \divide\c@pgf@counta by4096\relax%
    \global\advance\pgf@sys@svg@objectcount by1\relax%
    \pgf@process{#2}%
    % Divide by 2\pgf@sys@shading@end@pos%
    \pgf@x=8\pgf@x%
    \divide\pgf@x by \c@pgf@counta\relax%
    \pgf@y=8\pgf@y%
    \divide\pgf@y by \c@pgf@counta\relax%
    \advance\pgf@x by.5pt%
    \advance\pgf@y by.5pt%
    \pgf@sys@svg@addtostops{<radialGradient
      id="pgfsh\the\pgf@sys@svg@objectcount"
      fx="\pgf@sys@tonumber\pgf@x"
      fy="\pgf@sys@tonumber\pgf@y"
      >\noexpand\Hnewline}
    \pgf@sys@svg@shading@stops%
    \pgf@sys@svg@addtostops{</radialGradient>\noexpand\Hnewline}%
    \pgf@xa=\pgf@sys@shading@end@pos%
    \pgf@xb=2\pgf@xa%    
    \expandafter\xdef\csname @pgfshading#1!\endcsname{%
      \def\noexpand\pgf@sys@svg@sh@defs{\noexpand\pgfsysprotocol@literal{\pgf@sys@svg@thestops}}%
      \def\noexpand\pgf@sys@svg@sh{\noexpand\pgfsysprotocol@literal{<circle
        cx="\the\pgf@xa"
        cy="\the\pgf@xa"
        r="\the\pgf@xa"
        style="fill:url(\noexpand\#pgfsh\the\pgf@sys@svg@objectcount);
          stroke:none"/>\noexpand\Hnewline}}%
      \def\noexpand\pgf@sys@svg@pos{\noexpand\pgfpoint{\the\pgf@xb}{\the\pgf@xb}}%
    }%
  }%
}


\endinput


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